Abstract
The sompoton is one of famous traditional musical instruments in Sabah.
This instrument consists of several parts with the vibrator being the most
important one. In this paper, the vibrator is modeled as a clamped bar
with a uniformly distributed mass. By means of this model, the fundamental
frequency is analyzed with the use of an equivalent single degree of
freedom system (SDOF) and exact analysis. The vibrator is made of aluminum
in different sizes and is excited using a constant air jet to obtain its
fundamental resonance frequency. The fundamental frequency obtained from
the experimental measurement is compared with the theoretical values
calculated based on the equivalent SDOF and exact analysis theories. It is
found that the exact analysis gives a closer value to the experimental
results as compared to the SDOF system. Although both the experimental and
theoretical results exhibit the same trend, they are different in
magnitude. To overcome the differences in both theories, a correction
factor is added to account for the production errors.
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